Adams, Samuel, and Emeka Nkoro. “Optimizing Yam Production in Rivers State: Insights from a Cobb-Douglas Model Analysis”. Journal of Business and Economic Options 4, no. 2 (June 1, 2021): 1–6. Accessed March 4, 2025. http://resdojournals.com/index.php/jbeo/article/view/182.